#include "../include/linux/dvb/frontend.h"
#include "src/libdddvb.h"
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdint.h>

char line_start[16] = "";
char line_end[16]   = "\r";


uint32_t cc_errors = 0;
uint32_t packets = 0;
uint32_t payload_packets = 0;
uint32_t packet_errors = 0;

uint8_t cc[8192] = { 0 };

void proc_ts(int i, uint8_t *buf)
{
  uint16_t pid=0x1fff&((buf[1]<<8)|buf[2]);
  uint8_t ccin = buf[3] & 0x1F;
  
  if( buf[0] == 0x47 && (buf[1] & 0x80) == 0)
  {
    if( pid != 8191 )
    {
      if( ccin != 0 )
      {
        if( cc[pid] != 0 )
        {
          // TODO: 1 repetition allowed
          if( ( ccin & 0x10 ) != 0 && (((cc[pid] + 1) & 0x0F) != (ccin & 0x0F)) )  
            cc_errors += 1;
        }
        cc[pid] = ccin;
      }
      payload_packets += 1;
    }
  }
  else
    packet_errors += 1;
  
  if( (packets & 0x3FFF ) == 0)
  {
    printf("%s  Packets: %12u non null %12u, errors: %12u, CC errors: %12u%s", line_start, packets, payload_packets, packet_errors, cc_errors, line_end);
    fflush(stdout);
  }
  
  packets += 1;  
}

#define TSBUFSIZE (100*188)

void tscheck(int ts)
{
        uint8_t *buf;
        uint8_t id;
        int i, nts;
        int len;

	buf=(uint8_t *)malloc(TSBUFSIZE);

        
        while(1) {
                len=read(ts, buf, TSBUFSIZE);
                if (len<0) {
                        continue;
                }
                if (buf[0]!=0x47) {
                        read(ts, buf, 1);
                        continue;
                }
                if (len%188) { /* should not happen */
                        printf("blah\n");
                        continue;
                }
                nts=len/188;
                for (i=0; i<nts; i++)
                        proc_ts(i, buf+i*188);
        }
}
		    
static uint32_t root2gold(uint32_t root)
{
	uint32_t x, g;
	
	for (g = 0, x = 1; g < 0x3ffff; g++)  {
		if (root == x)
			return g;
		x = (((x ^ (x >> 7)) & 1) << 17) | (x >> 1);
	}
	return 0xffffffff;
}

int main(int argc, char **argv)
{
	struct dddvb *dd;
	struct dddvb_fe *fe;
	struct dddvb_params p;
	uint32_t bandwidth = DDDVB_UNDEF, frequency = 0, symbol_rate = 0, pol = DDDVB_UNDEF;
	uint32_t id = DDDVB_UNDEF, ssi = DDDVB_UNDEF, num = DDDVB_UNDEF, source = 0;
	uint32_t mtype= DDDVB_UNDEF;
	uint32_t verbosity = 0;
	enum fe_code_rate fec = FEC_AUTO;
	enum fe_delivery_system delsys = ~0;
	char *config = "config/";
	int fd = 0;
	int odvr = 0;
	FILE *fout = stdout;
	int line = -1;
	
	while (1) {
		int cur_optind = optind ? optind : 1;
                int option_index = 0;
		int c;
                static struct option long_options[] = {
			{"config", required_argument, 0, 'c'},
			{"frequency", required_argument, 0, 'f'},
			{"bandwidth", required_argument, 0, 'b'},
			{"symbolrate", required_argument, 0, 's'},
			{"source", required_argument, 0, 'l'},
			{"delsys", required_argument, 0, 'd'},
			{"id", required_argument, 0, 'i'},
			{"ssi", required_argument, 0, 'g'},
			{"gold", required_argument, 0, 'g'},
			{"root", required_argument, 0, 'r'},
			{"num", required_argument, 0, 'n'},
			{"mtype", required_argument, 0, 'm'},
			{"verbosity", required_argument, 0, 'v'},
			{"open_dvr", no_argument, 0, 'o'},
			{"tscheck", no_argument, 0, 't'},
			{"tscheck_l", required_argument, 0, 'a'},
			{"help", no_argument , 0, 'h'},
			{0, 0, 0, 0}
		};
                c = getopt_long(argc, argv, 
				"c:i:f:s:d:p:hg:r:n:b:l:v:m:ota:",
				long_options, &option_index);
		if (c==-1)
 			break;
		
		switch (c) {
		case 'o':
		        fout = stderr;
		        if (odvr) {
			    fprintf(fout,"Can't pipe dvr device when checking continuity\n");
			    break;
			}
		        fprintf(fout,"Reading from dvr\n");
		        odvr = 1;
			break;
		case 'a':
		        line = strtoul(optarg, NULL, 0);
		case 't':
		        fout = stderr;
		        if (odvr) {
			    fprintf(fout,"Can't check continuity when piping dvr device\n");
			    break;
			}
		        fprintf(fout,"performing continuity check\n");
		        odvr = 2;
			break;
		case 'c':
		        config = strdup(optarg);
			break;
		case 'f':
			frequency = strtoul(optarg, NULL, 0);
			break;
		case 'b':
			bandwidth = strtoul(optarg, NULL, 0);
			break;
		case 's':
			symbol_rate = strtoul(optarg, NULL, 0);
			break;
		case 'l':
			source = strtoul(optarg, NULL, 0);
			break;
		case 'v':
			verbosity = strtoul(optarg, NULL, 0);
			break;
		case 'g':
			ssi = strtoul(optarg, NULL, 0);
			break;
		case 'r':
			ssi = root2gold(strtoul(optarg, NULL, 0));
			break;
		case 'i':
			id = strtoul(optarg, NULL, 0);
			break;
		case 'n':
			num = strtoul(optarg, NULL, 0);
			break;
		case 'm':
			if (!strcmp(optarg, "16APSK"))
				mtype = APSK_16;
			if (!strcmp(optarg, "32APSK"))
				mtype = APSK_32;
			if (!strcmp(optarg, "64APSK"))
				mtype = APSK_64;
			if (!strcmp(optarg, "128APSK"))
				mtype = APSK_128;
			if (!strcmp(optarg, "256APSK"))
				mtype = APSK_256;
			if (mtype == DDDVB_UNDEF)
				printf("unknown mtype %s\n", optarg);
			break;
		case 'd':
			if (!strcmp(optarg, "C"))
				delsys = SYS_DVBC_ANNEX_A;
			if (!strcmp(optarg, "DVBC"))
				delsys = SYS_DVBC_ANNEX_A;
			if (!strcmp(optarg, "S"))
				delsys = SYS_DVBS;
			if (!strcmp(optarg, "DVBS"))
				delsys = SYS_DVBS;
			if (!strcmp(optarg, "S2"))
				delsys = SYS_DVBS2;
			if (!strcmp(optarg, "DVBS2"))
				delsys = SYS_DVBS2;
			if (!strcmp(optarg, "T"))
				delsys = SYS_DVBT;
			if (!strcmp(optarg, "DVBT"))
				delsys = SYS_DVBT;
			if (!strcmp(optarg, "T2"))
				delsys = SYS_DVBT2;
			if (!strcmp(optarg, "DVBT2"))
				delsys = SYS_DVBT2;
			if (!strcmp(optarg, "J83B"))
				delsys = SYS_DVBC_ANNEX_B;
			if (!strcmp(optarg, "ISDBC"))
				delsys = SYS_ISDBC;
			if (!strcmp(optarg, "ISDBT"))
				delsys = SYS_ISDBT;
			break;
		case 'p':
			if (!strcmp(optarg, "h") || !strcmp(optarg, "H"))
				pol = 1;
			if (!strcmp(optarg, "v") || !strcmp(optarg, "V"))
				pol = 0;
			break;
		case 'h':
		    fprintf(fout,"ddzap [-d delivery_system] [-p polarity] [-c config_dir] [-f frequency(Hz)]\n"
			       "      [-b bandwidth(Hz)] [-s symbol_rate(Hz)]\n"
			       "      [-g gold_code] [-r root_code] [-i id] [-n device_num]\n"
			       "      [-o (write dvr to stdout)]\n"
			       "      [-l (tuner source for unicable)]\n"
			       "      [-t [display line](continuity check)]\n"
			       "\n"
			       "      delivery_system = C,S,S2,T,T2,J83B,ISDBC,ISDBT\n"
			       "      polarity        = h/H,v/V\n"
			       "\n");
			exit(-1);
		default:
			break;
			
		}
	}
	if (optind < argc) {
	    fprintf(fout,"Warning: unused arguments\n");
	}

	if (delsys == ~0) {
	    fprintf(fout,"You have to choose a delivery system: -d (C|S|S2|T|T2)\n");
		exit(-1);
	}
	switch (delsys) {
	case SYS_DVBC_ANNEX_A:
		if (!symbol_rate)
			symbol_rate = 6900000;
		break;
	}

	dd = dddvb_init(config, verbosity);
	if (!dd) {
	    fprintf(fout,"dddvb_init failed\n");
		exit(-1);
	}
	fprintf(fout,"dvbnum = %u\n", dd->dvbfe_num);

	if (num != DDDVB_UNDEF)
		fe = dddvb_fe_alloc_num(dd, delsys, num);
	else
		fe = dddvb_fe_alloc(dd, delsys);
	if (!fe) {
	    fprintf(fout,"dddvb_fe_alloc failed\n");
		exit(-1);
	}
	dddvb_param_init(&p);
	dddvb_set_mtype(&p, mtype);
	dddvb_set_frequency(&p, frequency);
	dddvb_set_src(&p, source);
	dddvb_set_bandwidth(&p, bandwidth);
	dddvb_set_symbol_rate(&p, symbol_rate);
	dddvb_set_polarization(&p, pol);
	dddvb_set_delsys(&p, delsys);
	dddvb_set_id(&p, id);
	dddvb_set_ssi(&p, ssi);
	dddvb_dvb_tune(fe, &p);
#if 0
	{
		uint8_t ts[188];
		
		dddvb_ca_write(dd, 0, ts, 188);

	}
#endif
	if (!odvr){
		while (1) {
			fe_status_t stat;
			int64_t str, cnr;
			
			stat = dddvb_get_stat(fe);
			str = dddvb_get_strength(fe);
			cnr = dddvb_get_cnr(fe);
			
			printf("stat=%02x, str=%lld.%03llddB, snr=%lld.%03llddB \n",
			       stat, (long long int)str/1000,(long long int) abs(str%1000),(long long int) cnr/1000, (long long int)abs(cnr%1000));
		sleep(1);
		}
	} else {
#define BUFFSIZE (1024*188)
	        fe_status_t stat;
		char filename[150];
		uint8_t buf[BUFFSIZE];
		
		stat = 0;
		stat = dddvb_get_stat(fe);
		while (!(stat == 0x1f)) {
		        int64_t str, cnr;
		
			stat = dddvb_get_stat(fe);
			str = dddvb_get_strength(fe);
			cnr = dddvb_get_cnr(fe);
			
			fprintf(stderr,"stat=%02x, str=%lld.%03llddB, snr=%lld.%03llddB \n",
			       stat,(long long int) str/1000,(long long int) abs(str%1000),(long long int) cnr/1000, (long long int)abs(cnr%1000));
			sleep(1);
		}
		fprintf(stderr,"got lock on %s\n", fe->name);
		snprintf(filename,25,
			 "/dev/dvb/adapter%d/dvr%d",fe->anum, fe->fnum);
		fprintf(stderr,"opening %s\n", filename);
		if ((fd = open(filename ,O_RDONLY)) < 0){
		    fprintf(stderr,"Error opening input file:%s\n",filename);
		}
		if (odvr == 1){
		    while(1){
			read(fd,buf,BUFFSIZE);
			write(fileno(stdout),buf,BUFFSIZE);
		    }
		} else {
		    if( line >= 0 && line < 64 ){
			snprintf(line_start,sizeof(line_start)-1,"\0337\033[%d;0H",line);
			strncpy(line_end,"\0338",sizeof(line_end)-1);
		    }
		    tscheck(fd);
		}
	}
}